9861880250 has 32 divisors (see below), whose sum is σ = 18714370896. Its totient is φ = 3890707200.

The previous prime is 9861880247. The next prime is 9861880253. The reversal of 9861880250 is 520881689.

9861880250 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 99307²+1.

It is an interprime number because it is at equal distance from previous prime (9861880247) and next prime (9861880253).

It can be written as a sum of positive squares in 8 ways, for example, as 1 + 9861880249 = 1^2 + 99307^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 9861880195 and 9861880204.

It is not an unprimeable number, because it can be changed into a prime (9861880253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 251939 + ... + 288438.

Almost surely, 2^9861880250 is an apocalyptic number.

9861880250 is a deficient number, since it is larger than the sum of its proper divisors (8852490646).

9861880250 is a wasteful number, since it uses less digits than its factorization.

9861880250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540467 (or 540457 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 47.

The square root of 9861880250 is about 99307.0000050349. Note that the first 5 decimals coincide. The cubic root of 9861880250 is about 2144.4696700051.

The spelling of 9861880250 in words is "nine billion, eight hundred sixty-one million, eight hundred eighty thousand, two hundred fifty".